Sewing-machine.



J. FORMAN.

SEWING MACHINE.

APPucATmN man MAY 4. w14.

Patentad Apr. 20, 1915.

MRML

3 SHEETS-SHEET l.

THE NDRRIS PETERS C0.y PHOTC-LITHD., WASHNC-EYDN, D.

I. FORMAN.'

sEWlNG MACHINE.

APPLICATION FILED MAY 4, I9I4.

I l .ll @L5M m Patented Apr. 20, 1915.

3 SHEETS-SHBET 2,

THE MORRIS PETERS CO.. PHom-LITHO., WASHINGTON, D. C.

SEWING MACHINE.

APPLICATION FILED IIIAY 4. I9I4.

Ml IUI l m Patented A111. 20, 1915.

3 SHEETS-SHEET 3.

"IWI" III III;

THE NORRIS PETERS co.. PHoTnvLlTHn., wAsHnvnmN n n JOSEPH FORMAN, QF WALBROQK, MARYLAND.

SEWING-MACHINE.

iuiaaooi.

Application filed May 4, 1914.

To all 107mm it may concern Be it known that l, losnri-r FORMAN, a citizen of the' United States, residing at lllalbrook, State of Maryland, have invented certain new and useful improvements in Sewing-Machines; and l do declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in sewing machines.

The object of the invention is to provide a sewing machine which employs a single thread only and which is designed to form a stitch similar to ordinary hand sewing.

lilith this and other objects in view the invention consists of certain novel features of construction, and the combination and arrangement of parts as will be hereinafter described and claimed.

1n the accompanying drawings: Figure 1 represents a front elevation of this machine with the bed plate shown in section and the front wall or plate of the casing removed to disclose the interior of the heads. Fig. 2 shows a longitudinal section taken substantially on the line 2-2 of Fig. 1. Fig. 3 is an enlarged detail vertical section through one of the needle bars and the needle releasing member and guide arranged adjacent thereto with the needle in lowered p0- sition. Fig. 4 is a similar view with the needle in elevated position. Fig. 5 is a transverse vertical section taken on the line of Fig. 4: Fig. 6 is a similar view taken on the line 6 6 of Fig. 4. Fig. 7 is a transverse section taken on the line 7--7 of Fig. 4. Fig. 8 is a horizontal section taken on the line 8 8 of Fig. 2 looking downward. Fig. 9 is a similar view showing the thread drawing attachment in operative position. Fig. 10 is a transverse section taken on the line 10-10 of Fig. 9. Fig. 11 is a similar view taken on the line 11-11 of Fig. 8. Figs. 12, 13, 14, 15 and 16 show diagrammatic views illustrating the various positions of the needle bars during one cycle of the operation of the machine whereby two stitches are formed one on the lower face of the work and one on the upper face. y

ln the embodiment illustrated duplicate needle operating mechanism is shown arranged above and below the bed plate or work table 1, the construction of which is exactly alike each comprising a hollow Specication of Letters Patent.

Patented Apr.. 2U, 1915.

serial No. tasses.

L-shaped bracket 2 having a head 3 cast upon one end of the horizontal arm 2 thereof and a main shaft 4 mounted in suitable bearings within said horizontal arm 2', a bevel gear 5 being fixed to said main shaft preferably near its rear end. A band or driving wheel 6 is secured to the rear end of the upper main shaft 4 which projects through one end of the arm 2 and whereby motion is imparted to said upper main shaft 4 from any suitable source (not shown).

A vertical bar or rod 7 is rotatably mounted in suitable bearings in the hollow communicating upright arms of the brackets 2 and is provided with bevel gears 8 positioned to mesh with the bevel gears 5 on the rear ends of the upper and lower main shafts 4 whereby motion is transmitted from the upper main shaft to the lower main shaft as is clearly shown in Fig. 2.

Mounted on the front ends of these main shafts 4 within the heads 3 fre large bevel gears 9 which mesh with similar smaller gears 10 mounted in suitable vertically disposed bearings 11 in the heads 3 which are here shown formed in castings secured to said heads and which castings are also provided with horizontally disposed bearings 12 in which are revolubly mounted smaller bevel gears 13 which mesh with the gears 10 for a purpose to be described. These gears 9, 10 and 13 have the teeth thereofso proportioned that one revolution of the large gears 9 produces two complete revolutions of the small gears 13 for the purpose hereinafter to be described.

The large gears 9 have several teeth omitted as shown at 14 forming dwells or gaps for arresting the movement of the needle bars controlled thereby as will be hereinafter described.

Mounted to slide vertically in said heads 3are needle bars 15 which are adapted to move toward and away from each other at predetermined intervals for advancing and retracting a double pointed needle 16 carried by one of said bars which are adapted to alternately receive and hold the needle for passing it back and forth through the needle v opening in the work table and through the work disposed thereon in a manner to be described. y

An eccentrically disposed stud 17 extends laterally from the outer face of each gear 13 and has pivotally connected therewith one end of a pitman 18 the other end of which is pivotally connected with a casting 19 fixed on the needle bar 15 and by means of which the needle bar is actuated through its main shaft from the driving wheel 6. The upper and lower needle bars which move toward and away from each other are each provided at its needle engaging end with a needle socket 2O one side wall of which is formed by a laterally movable clamping jaw 21 pivotally mounted at its inner end at the inner end of the socket and which is yieldably held in operative position by a spring pressed yoke 22. r1`his yoke 22 as shown comprises two laterally spaced U-shaped members 23 and 24 the free ends ot the legs of which are connected together Vand to each other by anp apertured cross bar 25. The cross bars of the members 23 and 24 encircle the gripping jaw 21 and a headed stud or screw 26 passes through the aperture in the cross bar 25 which connects said members 23 and 2 4 and is engaged with the needle bar at a point diametrically opposite the jaw 21.

A comparatively strong coiled spring 27 encircles this stud 26 between the inner faceof the cross bar 25 and the needle bar with which it is connected and exerts its tension to force said yoke in a direction opposite to the opening direction of the jaw 21 and thereby rinly but yielda-bly holds said aw closed to reliably clamp one end of vthe needle 16.

A needle releasing member 23 is mounted in the path of the yoke 24 and is here shown in the form of a substantially L-shaped plate having a slot 29 extending longitudinally throughout both arms thereof and which is adapted to form guides for the head of the stud 26 which passes through said slot. The long arm of this member 28 is provided near its junction with the short arm with a laterally extending projection 30 which is positioned in the path of the cross bar 2.5 of the yoke y22 so that when the needle bar reaches a predetermined point this projection comes in contact with the cross bar 25 of the yoke .and forces it inward against the tension of the spring 27 thereby moving the cross bars of the members 23 and 24 out of engagement with the clamping Jaw 21 thereby releasing the .needle from .said clamping jaw and permitting it to be drawn out of the socket y20 in Aa'manner and for a purpose to be described.VV Thisreleasing action of the jaws 21 takes place when the needle bars which carry them reaches the extreme limit of their stroke in one direction, that is at the end of their stroke which approaches the work table. In Fig. 3 the releasing device is `shown in the act of .releasing the needle from the upper needle bar and Figs. 4 5 and 6 .show it in clamped operative position and with :the needle in raised position ready for its down stroke.

The gap 14 formed by the omission of the .teeth from the gear wheel 9 is so disposed as to arrest the movement of the needle bar with which it is connected at predetermined intervals.

A thread drawing or tightening attachment is here shown comprising two mutilated intermeshing gears 31 and 32 one oi which is lixed to the vertical shait 7 in a plane above the plane ot' the upper face oli' the table 1 and parallel therewith. The other gear 32 is fixed on a stud shaft 33 revolubly mounted in vertically spaced bearings in the form of apertured lugs 34 and 35 extending laterally from the outer lace or' the upright arm of the upper bracket 2. The gear 32 extends through an opening in said bracket arm as shown in Figs. 8, 9 and 11 and is provided with an angular arm 36 the free end oi' which has a resilient wire rod 37 mounted therein. This rod 37 has a laterally extending linger 38 at its free end for preventing the thread loop shown at 40 from slipping oli? said end. A coiled spring 39 is connected at one end with the arm 36 of the attachment and at its other end to a stud suitably positioned on the bed plate to adapt said spring to exert its tension for returning the rod 37 to normal position after it has been actuated by the engagement of the gears 31 and 32 on the rotation of shaft 7.

The needle operating mechanism being shown in duplicate and both driven by a single band wheel 6 motion being imparted direct therefrom to the upper main shaft 4 and to the lower main shai't through the vertical shaft 7 and the bevel gears thereon meshing with bevel gears on said main shafts, one oit' said shafts is rotated in one direction and the other in the opposite direction as shown by the arrows in Figs. 12 to 16.

In the use of this machine when the parts are in the position shown in Figs.' 3 and 12 with the needle 16 in the position which it assumes when being transferred from the upper to the lower needle bar and with the opposed points of said needle in the sockets of both needle bars and the yoke engaging projections engaging said yokes and forcing them against the tension of springs 27 to open the needle clamps 21, the gap or dwell 14 in the upper large gear wheel 9 is in engagement with the smaller gear 10 whereby said ,gear 10, ,the gear 13 and upper needle bar controlled thereby stand still a suiicient time to permit the needle 16 to be released and withdrawn from its socket 2O and transferred to the socket 20 of the lower mechanism. The length of time the needle bar stands still is controlled by the number of teeth omitted to -form the dwell 14. Thus it will be seen that when the dwell 14 of the upper gear 9 is Vready for engagement with gear 10 the Adwell 14 in the lower gear 9 is diametrically opposite its coperating gear 10 (see Fig. 12) and both needle bars 15 are at the eXtreme limit of their inward stroke with the yokes 22 thereof opposite the projections 30 on the needle releasing members whereby both latches or jaws 21 are opened. rlhe continued operation of the driving wheel 6 suflicient to cause the large gears 9 to make a quarter revolution will advance the work (by means not shown) and permit the needle 16 to be grasped and locked in the socket of the lower needle bar and the parts to assume the position shown in Fig. 13 with the yokes moved out of engagement with the projections. This movement draws the needle downward through the opening 0 in table 1 and through the work disposed thereon. Another quarter turn of large gears 9 advances the work on the table and passes needle 16 up through table 1 and work thereon into the position shown in Fig. 14 therebv forming the stitch S of Fig. 10. The dwell 1/1 of the upper gear 9 is then dialnetrically opposite its cooperating gear 10 and the dwell 11 in the lower gear 9 is engaged with its gear 10 thereby causing its needle bar to stand still long enough for the needle 16 to be withdrawn from the socket of the lower needle bar and be raised and clamped in the socket of the upper needle bar.

Another quarter turn of gears 9 advances the work and positions the parts as shown in Fig. 15 with the needle 16 ready to descend to form the stitch s of Fig. 10. Another quarter turn of gears 9 causes said needle to descend as shown in Fig. 16 whereby the parts are again `in the position shown in Fig. 14, the large gears having made one revolution and the small gears 13, which actuate the needle bars, two revolutions.

During the stitch forming operation above described the thread '1 which is threaded through the eye 16 of the needle 16 forms loop 110 when the large gears have made three ouarters of a revolution and the teeth of gears 31 and 32 are thereby brought into mesh causing the arm 37 which lies in the path of said loop to make an outward sweep as shown in Fig. 9 and thereby draw the thread to tighten it sufficiently to form the stitches S and s. After this arm has been so actuated the further turning of shaft 7 releases said arm and the spring 39 returns it to normal position as shown in Fig. 8.

1n the use of this machine when the parts are in the position shown'in Figs. 3 and 12 with the needle 16 in the position which it assumes when being transferred from the upper to the lower needle bar and with the opposed points of said needle in the sockets of both needle bars and the yoke engaging projections engaging said yokes and forcing them against the tension of springs 27 to open the needle clamps 21, the gap or dwell 14 in the upper large gear wheel 9 is ready for engagement with the smaller" gear 10 which occurs on the further turning of the gears 9 whereby said gear 10, the gear 13 and upper needle bar controlled thereby stand still a sullicient time to permit the needle 16 to be released and withdrawn from its socket 2O and transferred to the socket 20 of the lower mechanism. The length of time the needle bar stands still is controlled by the number of teeth omitted to form the dwell 141. Thus it will be seen that when the dwell 141 of the upper gear 9 is in engagement with gear 10 the dwell 14 in the lower gear 9 is diametrically opposite its coperating gear 10 (see Fig. 12) and both needle hars 15 are at the extreme limit of their inward stroke with the yokes 22 thereof opposite the projections 30 on the needle releasing members whereby both latches or jaws 21 are opened. The continued operation of the driving wheel 7 sufficient to cause the large gears 9 to make a quarter revolution will advance the work (by means not shown) and permit the needle 16 to be grasped and locked in the socket of the lower needle bar and the parts to assume the position shown in Fig. 13 with the yokes moved out of engagement with the projections. rFhis movement draws the needle downward through the opening O in table 1 and through the work disposed thereon. Another quarter turn of large gears 9 advances the work on the table and passes needle 16 up through table 1 and work thereon into the position shown in Fig. 14; thereby forming the stitch S of Fig. 10. The dwell 14.- of the upper gear 9 is then diametrically opposite its coperating gear 19 and the dwell 14.- in the lower gear 9 is ready for engagement with its gear 10 which causes its needle bar to stand still long enough for the needle 16 to be withdrawn from the socket of the lower needle bar and be raised and clamped in the socket of the upper needle bar. Another quarter turn of gears 9 advances the work and positions the parts as shown in Fig. 15 with the needle 16 ready to descend to form the stitch s of Fig. 10. Another quarter turn of gears 9 causes said needle to descend as shown in Fig. 6 whereby the parts are again in the position shown in Fig. 14, the large gears having made one revolution and the small gears 13, which actuate the needle bars, two revolutions.

During the stitch forming operation above described the thread T which is threaded through the eye 16 of the needle 16 forms loops 410 when the large gears have made three quarters of a revolution and the teeth of gears 31 and 32 are thereby brought into mesh causing the arm 37 which lies in the path of said loop to make an outward sweep as shown in Fig. 9 and thereby draw the thread to tighten it sufliciently to form the stitches S and s. After this arm has been so actuated the `further turning of shaft 7 releases said arm and the spring 39 returns it to normal position as shown in F ig. 8.

I claim as my invention:

l. ln a sewing machine the combination of two alined needle bars having needle receiving sockets and between which bars the material is fed, a double pointed needle adapted to be carried alternately in said sockets, a laterally'7 movable needle clamping jaw carried by each bar, a spring pressed yoke encircling said j aw, and means arranged in the path of said yoke for engaging it at predetermined intervals to release the needle.

2. In a sewing machine, the combination of two alined needle bars having needle receiving sockets and between which bars the material is fed, a double pointed needle adapted to be carried alternately in said sockets, a laterally movable needle clamping jaw carried by each bar, a spring pressed yoke encircling said bar and jaw, a stud eX- tending laterally from said bar at a point opposite said clamping jaw, a spring on said stud between said bar and said yoke for yieldably holding said jaw in closed position, and means in the path of said yoke for releasing said jaw.

3. ln a sewing machine, the combination of two alined needle bars having needle receiving sockets and between which bars the material is fed, a double pointed needle adapted to be carried alternately in said sockets, a laterally movable needle clamping jaw carried by each bar, a spring pressed yoke encircling said bar and jaw, a. stud extending laterally from said bar at a point opposite said clamping jaw, a spring on said stud between said bar and said yoke for yieldably holding said jaw in closed position, a slotted member arranged with the head of said stud extending through the slot in said member and said member having a laterally extending projection arranged in the path of said yoke to release said jaw at predetermined intervals.

In testimony whereoil I have hereunto set my hand in presence of two subscribing witnesses.

JOSEPH FORMAN.

lVitnesses MONTICELLO HALL, Jr., ROBERT WYNN.

C'opies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

